From: Richard Dumoulin (richard.dumoulin@vanco.es)
Date: Thu Apr 29 2004 - 04:31:54 GMT-3
Richard, this is what the employers expect from their engineers, being able
to find solutions even if the question is absurd. I believe it is also
required in the exam. Well done and thank you for making me learn something
today,
--Richard
-----Original Message-----
From: Edwards, Andrew M [mailto:andrew.m.edwards@boeing.com]
Sent: jueves, 29 de abril de 2004 1:05
To: Richard Davidson; Peter van Oene; ccielab@groupstudy.com
Subject: RE: Another burning question on BGP
Nonetheless, I'm glas I asked and thanks for the response Richard.
andy
-----Original Message-----
From: Richard Davidson [mailto:rich@myhomemail.net]
Sent: Wednesday, April 28, 2004 1:02 PM
To: Peter van Oene; ccielab@groupstudy.com
Subject: Re: Another burning question on BGP
I agree with Peter. However, if my memory serves me
this is what to do.
At the ASBR (R1) you are redistributing the BGP routes
into ospf and they are comming from the ASBR ospf
Router ID R1. Those routes get to R3 and they are
from ,,, you guessed it R1. Well stop there and
switch to BGP.
R1 & R3 both peers with R2 which is a RR. When the
BGP route gets to R3 it is from R2 "not R1". Sync
will fail.
Solution: swap BGP router IDs with R2 and R1. Now R1
sends a BGP route as if he is R2. R2 gets it and it
sends it as if it is R1 to R3. When R3 sees the BGP
route is from the R1 BGP Router ID and the OSPF route
is from the R1 ospf Router ID it will sync.
---------------------
{R1}---{R2}----{R3} |
|
AS1 |
---------------------
--- Peter van Oene <pvo@usermail.com> wrote:
> The short answer is that this is an @#$@'ing
> ridiculous scenario that is a
> complete waste of your time. If Cisco wants to test
> on it, then shame on
> them for forcing you to study such a moronic topic.
> There is nothing
> anywhere near a practical requirement for such a
> topology and
> synchronization is years more outdated than many of
> the already deprecated
> items that have found space on the CCIE lab.
>
>
>
> At 12:39 PM 4/28/2004, Edwards, Andrew M wrote:
> >I'm trying to understand methods to keep
> synchronization on in BGP and
> >provide BGP to OSPF redistribution with route
> reflectors.
> >
> >You know the problem where the route reflector
> server receives an update
> >from a route reflector client that is
> redistributing BGP to OSPF.
> >
> >When the route reflector server gets the update, it
> reflects that update
> >to all other RR clients but changes the BGP ID to
> itself.
> >
> >Obviously the other BGP RR clients get the BGP
> update but the OSPF
> >router ID and BGP ID do not match on the clients so
> the BGP route is not
> >marked
> >As a best path ">"
> >
> >So the question I have is what methods are
> available to make this work
> >with synchronization on and using route reflectors?
> >
> >Is the answer go to full mesh or transfer to
> confederations?
> >
> >I'm stumped on how to change the BGP router-id to
> the originators BGP
> >router ID on the RR server.
> >
> >Thanks for the input... or clearing up my
> confusion.
> >
> >Andy
> >
>
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